Series Series
KNAR/F, KNARP/F, KNAR-D/F, KNARP-D/F,
Page 12
KNAR-S/F, KNARP-S/F
ASME
9520-082-en
Revision 14
TM 9549
Edition 11/2017
9 Maintenance
All repair work is to be performed by qualified
personnel using the appropriate tools.
For the arrangement, designation and item
numbers of all parts of the valve, see
Section 10
.
Spare parts are to be ordered with all the details
in acc. with the valve identification.
Only original spare parts may be installed.
To prevent leaks, a regular check of the connec-
tion screws should be made in line with the oper-
ating requirements.
For torques see
Section 1.3
.
9.1 Dismantling
9.1.1 Ball valve with lever
Remove lever
203.
Take out grounding spring washer
557
.
Dismantle packing gland follower
503
and spring
gland follower
502
.
The thrust ring
405/1
, packing bellows
403
and
retaining washer
526
(not in 6" and 8") are one
unit and it is levered out using 2 screwdrivers.
Undo screw connection body end piece
102
/
main body
100
.
Remove body end piece
102
.
Remove V-control ball/stem unit
201
. Pay
attention so as not to damage the body lining.
Remove seat rings
401
.
9.1.2 Packing bellows
Remove retaining washer
526
.
Separate thrust ring
405/1
and packing bellows
403
by pushing them apart.
9.1.3 Ball valve with actuator
Undo setscrew
904/4
in the coupling
804
by one
turn.
Undo sleeve nut
512
on the coupling by about 2
turns. Left-hand thread. Observe drawing in
Sections 10.3 and 10.5
.
Remove actuator
850
and coupling
804
.
Dismantle packing gland follower
503
and spring
gland follower
502
.
Remove bracket
510
.
Further dismantling is performed as described in
Section 9.1.1
.
9.2 Assembly
Prior to assembly all parts are to be cleaned and
the plastic-lined components checked for damage.
Insert seat rings
401
in the main body
101
and
body end piece
102
.
Mount and adjust V-control ball/stem unit
201
. Pay
attention so as not to damage the body lining.
Notice the direction of flow. See sectional drawing
in
Section 10
.
An additional bore in the ball/stem unit, e.g. to
ensure it is cavity-free, must lie on the p1 side in
the closed position.
Mount body end piece
102
. Tighten the body
screws to a tightening torque according to
Section
1.3
in diametrically opposite sequence.
9.2.1 Packing bellows
Press thrust ring
405/1
into packing bellows
403
.
Install retaining washer
526
(not in 6" and 8").
Press unit into body end piece
102
.
Press in grounding spring washer
557
.
9.2.2 Ball valve with lever
Mount lever stop
577
, spring gland follower
502
(in
3", 4", 6" and 8" are 2 spring gland followers
502
)
and packing gland follower
503
. Tighten packing
nuts until there is no gap between packing gland
follower and spring gland follower. See
Section
1.2 and 10
.
Notice direction of rotation of V-control ball/stem.
Seal any tapped bores still open with plugs.
Mount lever
203
.
9.2.3 Ball valve with actuator
Mount spring gland follower
502
(in 3", 4", 6" and
8" are 2 spring gland followers
502
) and packing
gland follower
503
. Tighten packing nuts until
there is no gap between packing gland follower
and spring gland follower.
See
Section 1.2 and 10
.
Mount bracket
510
with the opening at right angles
to the direction of flow.
Mount coupling
804
and actuator
850
. Notice
direction of rotation of V-control ball/stem unit
201
.
Observe the actuator position in accordance with
the actuator operating manual.
